Testing Carbon-Coated VOx Prepared via Reaction under Autogenic Pressure at Elevated Temperature as Li-Insertion Materials†

摘要: V2O3 powder is frequently used in conductive polymer composites and catalysts. In addition, a variety of VOx MVOx (e.g., V2O5, V6O13, CaV3O7) compounds have been suggested tested as cathode materials for rechargeable Li batteries. These vanadium oxide-based are still among the most intensively studied It should be noted that studies related to Li-battery high interest science. The synthesis spherical nanoparticles by reductive pyrolysis ammonium oxovanadium(IV) carbonato hydroxide has reported. Nanocrystalline was synthesized thermal decomposition divanadium pentoxide Su Schlogl. this report, we present results RAPET dissociation (RAPET: reaction under autogenic pressure at elevated temperatures) VO(OC2H5)3, which produces carbon-coated oxide (CCVO). This novel method, using only metallic alkoxide precursor absence catalyst or solvent, one-step process yielding core/shell morphology. Further oxidation CCVO V2O5 (CCV2O5) nanoparticles. study, explore what extent carbon shell enables electrical contact particles, while not interfering with smooth intercalation particles. interesting discover whether these active can composite electrodes batteries, they would possibly reduce need significant addition carbonaceous materials, order maintain particles between mass current collector. Usually, cathodes based on Li-intercalating transition-metal oxides sulfides include additional (5–15 wt %) achieve collector (and themselves). As smaller (which may very important achieving rates), critical problems arise regarding properties electrodes, because direct all small mass. Hence, use an where each particle coated thin (conductive) layer permeable ions advantageous application. paper first report hydrogen content samples determined elemental analysis measurements. calculated percentage precursor, 44.3 %, 9.6 %. measured (CCV2O3) product usually 30 0.3 it obvious products show less than reactants, almost negligible. means some reduction reactants and/or bound form hydrocarbons. Furthermore, production involves transition metal (from V V), probably acting reducing agent temperature. Figure 1 presents X-ray diffraction (XRD) patterns sonolysis (a) (b). XRD pattern as-prepared sample presented 1b shows peaks 2h= 24.3, 33.0, 36.3, 38.5, 41.2, 49.8, 53.9, 63.2, 65.2, 70.7 °, assigned (012), (104), (110), (113), (024), (116), (214), (300), (1010) reflection lines rhombohedral phase. values good agreement peaks, peak intensity, cell parameters crystalline (Powder file (PDF) No. 34-0187, available from International Centre Diffraction Data through http:// www.icdd.com).The average size ca. 50 nm, Scherrer equation. No characteristic were observed products, indicating coating amorphous nature. C O M U N IC A IO S